arch: remove get_task_comm() and print task comm directly

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer. This
simp

arch: remove get_task_comm() and print task comm directly

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer. This
simplifies the code and avoids unnecessary operations.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yafang Shao <[email protected]>
Cc: Vineet Gupta <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: "André Almeida" <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: James Morris <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Oded Gabbay <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: Simona Vetter <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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arc: get rid of private asm/unaligned.h

Declarations local to arch/*/kernel/*.c are better off *not* in a public
header - arch/arc/kernel/unaligned.h is just fine for those
bits.

Unlike the parisc

arc: get rid of private asm/unaligned.h

Declarations local to arch/*/kernel/*.c are better off *not* in a public
header - arch/arc/kernel/unaligned.h is just fine for those
bits.

Unlike the parisc case, here we have an extra twist - asm/mmu.h
has an implicit dependency on struct pt_regs, and in some users
that used to be satisfied by include of asm/ptrace.h from
asm/unaligned.h (note that asm/mmu.h itself did _not_ pull asm/unaligned.h
- it relied upon the users having pulled asm/unaligned.h before asm/mmu.h
got there).

Seeing that asm/mmu.h only wants struct pt_regs * arguments in
an extern, just pre-declare it there - less brittle that way.

With that done _all_ asm/unaligned.h instances are reduced to include
of asm-generic/unaligned.h and can be removed - unaligned.h is in
mandatory-y in include/asm-generic/Kbuild.

What's more, we can move asm-generic/unaligned.h to linux/unaligned.h
and switch includes of <asm/unaligned.h> to <linux/unaligned.h>; that's
better off as an auto-generated commit, though, to be done by Linus
at -rc1 time next cycle.

Acked-by: Vineet Gupta <[email protected]>
Signed-off-by: Al Viro <[email protected]>

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ARC: fix typos in comments

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall <[email protected]>
Signed-off-by: Vineet Gupta <vgupta@kerne

ARC: fix typos in comments

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Enrico Weigelt <[email protected]>
Reviewed-by: Kate Stewart <[email protected]>
Reviewed-by: Allison Randal <[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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ARC: [arcompact] brown paper bag bug in unaligned access delay slot fixup

Reported-by: Jo-Philipp Wich <[email protected]>
Fixes: 9aed02feae57bf7 ("ARC: [arcompact] handle unaligned access delay slot")
Cc:

ARC: [arcompact] brown paper bag bug in unaligned access delay slot fixup

Reported-by: Jo-Philipp Wich <[email protected]>
Fixes: 9aed02feae57bf7 ("ARC: [arcompact] handle unaligned access delay slot")
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Vineet Gupta <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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ARC: [arcompact] handle unaligned access delay slot corner case

After emulating an unaligned access in delay slot of a branch, we
pretend as the delay slot never happened - so return back to actual

ARC: [arcompact] handle unaligned access delay slot corner case

After emulating an unaligned access in delay slot of a branch, we
pretend as the delay slot never happened - so return back to actual
branch target (or next PC if branch was not taken).

Curently we did this by handling STATUS32.DE, we also need to clear the
BTA.T bit, which is disregarded when returning from original misaligned
exception, but could cause weirdness if it took the interrupt return
path (in case interrupt was acive too)

One ARC700 customer ran into this when enabling unaligned access fixup
for kernel mode accesses as well

Cc: [email protected]
Signed-off-by: Vineet Gupta <[email protected]>

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ARC: change some branchs to jumps to resolve linkage errors

When kernel's binary becomes large enough (32M and more) errors
may occur during the final linkage stage. It happens because
the build sys

ARC: change some branchs to jumps to resolve linkage errors

When kernel's binary becomes large enough (32M and more) errors
may occur during the final linkage stage. It happens because
the build system uses short relocations for ARC by default.
This problem may be easily resolved by passing -mlong-calls
option to GCC to use long absolute jumps (j) instead of short
relative branchs (b).

But there are fragments of pure assembler code exist which use
branchs in inappropriate places and cause a linkage error because
of relocations overflow.

First of these fragments is .fixup insertion in futex.h and
unaligned.c. It inserts a code in the separate section (.fixup)
with branch instruction. It leads to the linkage error when
kernel becomes large.

Second of these fragments is calling scheduler's functions
(common kernel code) from entry.S of ARC's code. When kernel's
binary becomes large it may lead to the linkage error because
scheduler may occur far enough from ARC's code in the final
binary.

Signed-off-by: Yuriy Kolerov <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>

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ARC: perf: Enable generic software events

Signed-off-by: Vineet Gupta <[email protected]>

ARC: Handle zero-overhead-loop in unaligned access handler

If a load or store is the last instruction in a zero-overhead-loop, and
it's misaligned, the loop would execute only once.

This fixes that

ARC: Handle zero-overhead-loop in unaligned access handler

If a load or store is the last instruction in a zero-overhead-loop, and
it's misaligned, the loop would execute only once.

This fixes that problem.

Signed-off-by: Mischa Jonker <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>

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ARC: Handle un-aligned user space access in BE.

Adding endian awarness to un-aligned access exception handling.

Signed-off-by: Noam Camus <[email protected]>
Signed-off-by: Vineet Gupta <vgupta@syno

ARC: Handle un-aligned user space access in BE.

Adding endian awarness to un-aligned access exception handling.

Signed-off-by: Noam Camus <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>

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ARC: Remove explicit passing around of ECR

With ECR now part of pt_regs

* No need to propagate from lowest asm handlers as arg
* No need to save it in tsk->thread.cause_code
* Avoid bit chopping to

ARC: Remove explicit passing around of ECR

With ECR now part of pt_regs

* No need to propagate from lowest asm handlers as arg
* No need to save it in tsk->thread.cause_code
* Avoid bit chopping to access the bit-fields

More code consolidation, cleanup

Signed-off-by: Vineet Gupta <[email protected]>

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ARC: Unaligned access emulation

ARC700 doesn't natively support unaligned access, but can be emulated
-Unaligned Access Exception
-Disassembly at the Fault address to find the exact insn (long/short

ARC: Unaligned access emulation

ARC700 doesn't natively support unaligned access, but can be emulated
-Unaligned Access Exception
-Disassembly at the Fault address to find the exact insn (long/short)

Also per Arnd's comment, we runtime control it using 2 sysctl knobs:
* SYSCTL_ARCH_UNALIGN_ALLOW: Runtime enable/disble
* SYSCTL_ARCH_UNALIGN_NO_WARN: Warn on each emulation attempt

Originally contributed by Tim Yao <[email protected]>

Signed-off-by: Vineet Gupta <[email protected]>
Cc: Tim Yao <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>

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