lib/cmdline: avoid page fault in next_arg

An argument list like "arg=val arg2 \"" can trigger a page fault if the
page pointed by 'args[0xffffffff]' is not mapped and potential memory
corruption oth

lib/cmdline: avoid page fault in next_arg

An argument list like "arg=val arg2 \"" can trigger a page fault if the
page pointed by 'args[0xffffffff]' is not mapped and potential memory
corruption otherwise (unlikely but possible if the bogus address is mapped
and contents happen to match the ascii value of the quote character).

The fix is to ensure that we load 'args[i-1]' only when (i > 0).

Prior to this commit the following command would trigger an
unhandled page fault in the kernel:

root@(none):/linus/fs/fat# insmod ./fat.ko "foo=bar \""
[ 33.870507] BUG: unable to handle page fault for address: ffff888204252608
[ 33.872180] #PF: supervisor read access in kernel mode
[ 33.873414] #PF: error_code(0x0000) - not-present page
[ 33.874650] PGD 4401067 P4D 4401067 PUD 0
[ 33.875321] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC PTI
[ 33.876113] CPU: 16 PID: 399 Comm: insmod Not tainted 5.19.0-dbg-DEV #4
[ 33.877193] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[ 33.878739] RIP: 0010:next_arg+0xd1/0x110
[ 33.879399] Code: 22 75 1d 41 c6 04 01 00 41 80 f8 22 74 18 eb 35 4c 89 0e 45 31 d2 4c 89 cf 48 c7 02 00 00 00 00 41 80 f8 22 75 1f 41 8d 42 ff <41> 80 3c 01 22 75 14 41 c6 04 01 00 eb 0d 48 c7 02 00 00 00 00 41
[ 33.882338] RSP: 0018:ffffc90001253d08 EFLAGS: 00010246
[ 33.883174] RAX: 00000000ffffffff RBX: ffff888104252608 RCX: 0fc317bba1c1dd00
[ 33.884311] RDX: ffffc90001253d40 RSI: ffffc90001253d48 RDI: ffff888104252609
[ 33.885450] RBP: ffffc90001253d10 R08: 0000000000000022 R09: ffff888104252609
[ 33.886595] R10: 0000000000000000 R11: ffffffff82c7ff20 R12: 0000000000000282
[ 33.887748] R13: 00000000ffff8000 R14: 0000000000000000 R15: 0000000000007fff
[ 33.888887] FS: 00007f04ec7432c0(0000) GS:ffff88813d300000(0000) knlGS:0000000000000000
[ 33.890183] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 33.891111] CR2: ffff888204252608 CR3: 0000000100f36005 CR4: 0000000000170ee0
[ 33.892241] Call Trace:
[ 33.892641] <TASK>
[ 33.892989] parse_args+0x8f/0x220
[ 33.893538] load_module+0x138b/0x15a0
[ 33.894149] ? prepare_coming_module+0x50/0x50
[ 33.894879] ? kernel_read_file_from_fd+0x5f/0x90
[ 33.895639] __se_sys_finit_module+0xce/0x130
[ 33.896342] __x64_sys_finit_module+0x1d/0x20
[ 33.897042] do_syscall_64+0x44/0xa0
[ 33.897622] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 33.898434] RIP: 0033:0x7f04ec85ef79
[ 33.899009] Code: 48 8d 3d da db 0d 00 0f 05 eb a5 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c7 9e 0d 00 f7 d8 64 89 01 48
[ 33.901912] RSP: 002b:00007fffae81bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 33.903081] RAX: ffffffffffffffda RBX: 0000559c5f1d2640 RCX: 00007f04ec85ef79
[ 33.904191] RDX: 0000000000000000 RSI: 0000559c5f1d12a0 RDI: 0000000000000003
[ 33.905304] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 33.906421] R10: 0000000000000003 R11: 0000000000000246 R12: 0000559c5f1d12a0
[ 33.907526] R13: 0000000000000000 R14: 0000559c5f1d25f0 R15: 0000559c5f1d12a0
[ 33.908631] </TASK>
[ 33.908986] Modules linked in: fat(+) [last unloaded: fat]
[ 33.909843] CR2: ffff888204252608
[ 33.910375] ---[ end trace 0000000000000000 ]---
[ 33.911172] RIP: 0010:next_arg+0xd1/0x110
[ 33.911796] Code: 22 75 1d 41 c6 04 01 00 41 80 f8 22 74 18 eb 35 4c 89 0e 45 31 d2 4c 89 cf 48 c7 02 00 00 00 00 41 80 f8 22 75 1f 41 8d 42 ff <41> 80 3c 01 22 75 14 41 c6 04 01 00 eb 0d 48 c7 02 00 00 00 00 41
[ 33.914643] RSP: 0018:ffffc90001253d08 EFLAGS: 00010246
[ 33.915446] RAX: 00000000ffffffff RBX: ffff888104252608 RCX: 0fc317bba1c1dd00
[ 33.916544] RDX: ffffc90001253d40 RSI: ffffc90001253d48 RDI: ffff888104252609
[ 33.917636] RBP: ffffc90001253d10 R08: 0000000000000022 R09: ffff888104252609
[ 33.918727] R10: 0000000000000000 R11: ffffffff82c7ff20 R12: 0000000000000282
[ 33.919821] R13: 00000000ffff8000 R14: 0000000000000000 R15: 0000000000007fff
[ 33.920908] FS: 00007f04ec7432c0(0000) GS:ffff88813d300000(0000) knlGS:0000000000000000
[ 33.922125] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 33.923017] CR2: ffff888204252608 CR3: 0000000100f36005 CR4: 0000000000170ee0
[ 33.924098] Kernel panic - not syncing: Fatal exception
[ 33.925776] Kernel Offset: disabled
[ 33.926347] Rebooting in 10 seconds..

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Neel Natu <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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lib/cmdline: Export next_arg() for being used in modules

At least one module will benefit from using next_arg() helper.
Let's export it for that module and others if they consider it
helpful.

Signe

lib/cmdline: Export next_arg() for being used in modules

At least one module will benefit from using next_arg() helper.
Let's export it for that module and others if they consider it
helpful.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>

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lib/cmdline: remove an unneeded local variable in next_arg()

The local variable 'next' is unneeded because you can simply advance the
existing pointer 'args'.

Link: https://lkml.kernel.org/r/202102

lib/cmdline: remove an unneeded local variable in next_arg()

The local variable 'next' is unneeded because you can simply advance the
existing pointer 'args'.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib/cmdline: Allow get_options() to take 0 to validate the input

Allow get_options() to take 0 as a number of integers parameter to validate
the input.

Signed-off-by: Andy Shevchenko <andriy.shevch

lib/cmdline: Allow get_options() to take 0 to validate the input

Allow get_options() to take 0 as a number of integers parameter to validate
the input.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>

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lib/cmdline: Update documentation to reflect behaviour

get_options() API has some tricks to optimize that may be not so obvious
to the caller. Update documentation to reflect current behaviour.

Sig

lib/cmdline: Update documentation to reflect behaviour

get_options() API has some tricks to optimize that may be not so obvious
to the caller. Update documentation to reflect current behaviour.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>

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lib/cmdline: allow NULL to be an output for get_option()

In the future we would like to use get_option() to only validate the
string and parse it separately. To achieve this, allow NULL to be an
ou

lib/cmdline: allow NULL to be an output for get_option()

In the future we would like to use get_option() to only validate the
string and parse it separately. To achieve this, allow NULL to be an
output for get_option().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: David Gow <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Matti Vaittinen <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Vitor Massaru Iha <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib/cmdline: fix get_option() for strings starting with hyphen

When string doesn't have an integer and starts from hyphen get_option()
may return interesting results. Fix it to return 0.

The simpl

lib/cmdline: fix get_option() for strings starting with hyphen

When string doesn't have an integer and starts from hyphen get_option()
may return interesting results. Fix it to return 0.

The simple_strtoull() is used due to absence of simple_strtoul() in a boot
code on some architectures.

Note, the Fixes tag below is rather for anthropological curiosity.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: f68565831e72 ("Import 2.4.0-test2pre3")
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: David Gow <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Matti Vaittinen <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Vitor Massaru Iha <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead of
letting the code f

lib: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead of
letting the code fall through to the next case, and by replacing a
number of /* fall through */ comments with the new pseudo-keyword
macro fallthrough.

Notice that Clang doesn't recognize /* Fall through */ comments as
implicit fall-through markings.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <[email protected]>

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Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"

This reverts commit 6a9dc5fd6170 ("lib: Revert use of fallthrough
pseudo-keyword in lib/")

Now that we can build arch/powerpc/boot/ fr

Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"

This reverts commit 6a9dc5fd6170 ("lib: Revert use of fallthrough
pseudo-keyword in lib/")

Now that we can build arch/powerpc/boot/ free of -Wimplicit-fallthrough,
re-enable these fixes for lib/.

Signed-off-by: Nick Desaulniers <[email protected]>
Tested-by: Nathan Chancellor <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Reviewed-by: Miguel Ojeda <[email protected]>
Link: https://github.com/ClangBuiltLinux/linux/issues/236
Signed-off-by: Gustavo A. R. Silva <[email protected]>

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lib: Revert use of fallthrough pseudo-keyword in lib/

The following build error for powerpc64 was reported by Nathan Chancellor:

"$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e

lib: Revert use of fallthrough pseudo-keyword in lib/

The following build error for powerpc64 was reported by Nathan Chancellor:

"$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ

$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
...
In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
from arch/powerpc/boot/decompress.c:38:
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
586 | fallthrough;
| ^~~~~~~~~~~

This will end up affecting distribution configurations such as Debian
and OpenSUSE according to my testing. I am not sure what the solution
is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure
that compiler_attributes.h can be safely included."

In order to avoid these sort of problems, it seems that the best
solution is to use /* fall through */ comments instead of the
fallthrough pseudo-keyword macro in lib/, for now.

Reported-by: Nathan Chancellor <[email protected]>
Fixes: df561f6688fe ("treewide: Use fallthrough pseudo-keyword")
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Reviewed-and-tested-by: Nathan Chancellor <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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treewide: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through mar

treewide: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230

Based on 2 normalized pattern(s):

this source code is licensed under the gnu general public license
version 2 see the file cop

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230

Based on 2 normalized pattern(s):

this source code is licensed under the gnu general public license
version 2 see the file copying for more details

this source code is licensed under general public license version 2
see

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 52 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Enrico Weigelt <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Reviewed-by: Alexios Zavras <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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lib/cmdline.c: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning

lib/cmdline.c: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

lib/cmdline.c:137:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
lib/cmdline.c:140:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
lib/cmdline.c:143:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
lib/cmdline.c:146:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
lib/cmdline.c:149:7: warning: this statement may fall through [-Wimplicit-fallthrough=]

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough.

Acked-by: Kees Cook <[email protected]>
Signed-off-by: Gustavo A. R. Silva <[email protected]>

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lib/cmdline.c: remove meaningless comment

One line of code was commented out by c++ style comment for debugging, but
forgot removing it.

Clean it up.

Link: http://lkml.kernel.org/r/1503312113-1184

lib/cmdline.c: remove meaningless comment

One line of code was commented out by c++ style comment for debugging, but
forgot removing it.

Clean it up.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Baoquan He <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib/cmdline.c: fix get_options() overflow while parsing ranges

When using get_options() it's possible to specify a range of numbers,
like 1-100500. The problem is that it doesn't track array size w

lib/cmdline.c: fix get_options() overflow while parsing ranges

When using get_options() it's possible to specify a range of numbers,
like 1-100500. The problem is that it doesn't track array size while
calling internally to get_range() which iterates over the range and
fills the memory with numbers.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ilya V. Matveychikov <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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boot/param: Move next_arg() function to lib/cmdline.c for later reuse

next_arg() will be used to parse boot parameters in the x86/boot/compressed code,
so move it to lib/cmdline.c for better code re

boot/param: Move next_arg() function to lib/cmdline.c for later reuse

next_arg() will be used to parse boot parameters in the x86/boot/compressed code,
so move it to lib/cmdline.c for better code reuse.

No change in functionality.

Signed-off-by: Baoquan He <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Jessica Yu <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Larry Finger <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Niklas Söderlund <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: zijun_hu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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lib: Add a generic cmdline parse function parse_option_str

There should be a generic function to parse params like a=b,c
Adding parse_option_str in lib/cmdline.c which will return true
if there's sp

lib: Add a generic cmdline parse function parse_option_str

There should be a generic function to parse params like a=b,c
Adding parse_option_str in lib/cmdline.c which will return true
if there's specified option set in the params.

Also updated efi=old_map parsing code to use the new function

Signed-off-by: Dave Young <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>

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lib/cmdline.c: add size unit t/p/e to memparse

For modern filesystems such as btrfs, t/p/e size level operations are
common. add size unit t/p/e parsing to memparse

Signed-off-by: Gui Hecheng <gui

lib/cmdline.c: add size unit t/p/e to memparse

For modern filesystems such as btrfs, t/p/e size level operations are
common. add size unit t/p/e parsing to memparse

Signed-off-by: Gui Hecheng <[email protected]>
Acked-by: David Rientjes <[email protected]>
Reviewed-by: Satoru Takeuchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib/cmdline.c: declare exported symbols immediately

WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
+EXPORT_SYMBOL(memparse);

WARNING: EXPORT_SYMBOL(foo); should immedi

lib/cmdline.c: declare exported symbols immediately

WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
+EXPORT_SYMBOL(memparse);

WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
+EXPORT_SYMBOL(get_option);

WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
+EXPORT_SYMBOL(get_options);

Signed-off-by: Felipe Contreras <[email protected]>
Cc: Levente Kurusa <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib/cmdline.c: fix style issues

WARNING: space prohibited between function name and open parenthesis '('
+int get_option (char **str, int *pint)

WARNING: space prohibited between function name and

lib/cmdline.c: fix style issues

WARNING: space prohibited between function name and open parenthesis '('
+int get_option (char **str, int *pint)

WARNING: space prohibited between function name and open parenthesis '('
+ *pint = simple_strtol (cur, str, 0);

ERROR: trailing whitespace
+ $

WARNING: please, no spaces at the start of a line
+ $

WARNING: space prohibited between function name and open parenthesis '('
+ res = get_option ((char **)&str, ints + i);

Signed-off-by: Felipe Contreras <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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lib: reduce the use of module.h wherever possible

For files only using THIS_MODULE and/or EXPORT_SYMBOL, map
them onto including export.h -- or if the file isn't even
using those, then just delete t

lib: reduce the use of module.h wherever possible

For files only using THIS_MODULE and/or EXPORT_SYMBOL, map
them onto including export.h -- or if the file isn't even
using those, then just delete the include. Fix up any implicit
include dependencies that were being masked by module.h along
the way.

Signed-off-by: Paul Gortmaker <[email protected]>

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generic, memparse(): constify argument

memparse()'s first argument can be const, so it should be.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Andrew Morton <akpm@linux-f

generic, memparse(): constify argument

memparse()'s first argument can be const, so it should be.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

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lib: allow memparse() to accept a NULL and ignorable second parm

Extend memparse() to allow the caller to use a NULL second parameter, which
would represent no interest in returning the address of t

lib: allow memparse() to accept a NULL and ignorable second parm

Extend memparse() to allow the caller to use a NULL second parameter, which
would represent no interest in returning the address of the end of the parsed
string.

In numerous cases, callers invoke memparse() to parse a possibly-suffixed
string (such as "64K" or "2G" or whatever) and define a character pointer to
accept the end pointer being returned by memparse() even though they have no
interest in it and promptly throw it away.

This (backward-compatible) enhancement allows callers to use NULL in the cases
where they just don't care about getting back that end pointer.

[[email protected]: coding-style fixes]
Signed-off-by: Robert P. J. Day <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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[PATCH] Numerous fixes to kernel-doc info in source files.

A variety of (mostly) innocuous fixes to the embedded kernel-doc content in
source files, including:

* make multi-line initial descripti

[PATCH] Numerous fixes to kernel-doc info in source files.

A variety of (mostly) innocuous fixes to the embedded kernel-doc content in
source files, including:

* make multi-line initial descriptions single line
* denote some function names, constants and structs as such
* change erroneous opening '/*' to '/**' in a few places
* reword some text for clarity

Signed-off-by: Robert P. J. Day <[email protected]>
Cc: "Randy.Dunlap" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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[PATCH] get_options to allow a hypenated range for isolcpus

This allows a hyphenated range of positive numbers in the string passed
to command line helper function, get_options.

Currently the comma

[PATCH] get_options to allow a hypenated range for isolcpus

This allows a hyphenated range of positive numbers in the string passed
to command line helper function, get_options.

Currently the command line option "isolcpus=" takes as its argument a
list of cpus.

Format: <cpu number>,...,<cpu number>
Valid values of <cpu_number> include all cpus, 0 to "number of CPUs in
system - 1". This can get extremely long when isolating the majority of
cpus on a large system. The kernel isolcpus code would not need any
changing to use this feature. To use it, the change would be in the
command line format for 'isolcpus='
Format:
<cpu number>,...,<cpu number>
or
<cpu number>-<cpu number> (must be a positive range in ascending
order.)
or a mixture
<cpu number>,...,<cpu number>-<cpu number>

Signed-off-by: Derek Fults <[email protected]>
Cc: "Randy.Dunlap" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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