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powerpc: Don't use __put_user() in patch_instruction

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patch_instruction() can be called very early on ppc32, when the kernel
isn't yet running at it's linked address. That can cause the !
is_kernel_addr() test in __put_user() to trip and call might_sleep()
which is very bad at that point during boot.

Use a lower level function instead for now, at least until we get to
rework ppc32 boot process to do the code patching later, like ppc64
does.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2012-09-04 15:08:28 +00:00
parent 9fb1b36ca1
commit 636802ef96
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/lib/code-patching.c
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@ -20,7 +20,7 @@ int patch_instruction(unsigned int *addr, unsigned int instr)
{
int err;
err = __put_user(instr, addr);
__put_user_size(instr, addr, 4, err);
if (err)
return err;
asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (addr));