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ARM: 9180/1: Thumb2: align ALT_UP() sections in modules sufficiently

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When building for Thumb2, the .alt.smp.init sections that are emitted by
the ALT_UP() patching code may not be 32-bit aligned, even though the
fixup_smp_on_up() routine expects that. This results in alignment faults
at module load time, which need to be fixed up by the fault handler.

So let's align those sections explicitly, and prevent this from occurring.

Cc: <stable@vger.kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Ard Biesheuvel 2022-01-18 19:32:17 +01:00 • committed by Russell King (Oracle)
parent 15420269b0
commit 9f80ccda53
2 changed files with 3 additions and 0 deletions
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2
arch/arm/include/asm/assembler.h
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@ -288,6 +288,7 @@
*/
#define ALT_UP(instr...) \
.pushsection ".alt.smp.init", "a" ;\
.align 2 ;\
.long 9998b - . ;\
9997: instr ;\
.if . - 9997b == 2 ;\
@ -299,6 +300,7 @@
.popsection
#define ALT_UP_B(label) \
.pushsection ".alt.smp.init", "a" ;\
.align 2 ;\
.long 9998b - . ;\
W(b) . + (label - 9998b) ;\
.popsection

1
arch/arm/include/asm/processor.h
View file

@ -96,6 +96,7 @@ unsigned long __get_wchan(struct task_struct *p);
#define __ALT_SMP_ASM(smp, up) \
"9998: " smp "\n" \
" .pushsection \".alt.smp.init\", \"a\"\n" \
" .align 2\n" \
" .long 9998b - .\n" \
" " up "\n" \
" .popsection\n"