Commit f8340dda authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Sasha Levin

powerpc/asm: Mark cr0 as clobbered in mftb()

[ Upstream commit 2400fd82 ]

The workaround for the CELL timebase bug does not correctly mark cr0 as
being clobbered. This means GCC doesn't know that the asm block changes cr0 and
might leave the result of an unrelated comparison in cr0 across the block, which
we then trash, leading to basically random behaviour.

Fixes: 859deea9 ("[POWERPC] Cell timebase bug workaround")
Cc: stable@vger.kernel.org # v2.6.19+
Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
[mpe: Tweak change log and flag for stable]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 726f177c
......@@ -1237,7 +1237,7 @@ static inline unsigned long mfvtb (void)
" .llong 0\n" \
".previous" \
: "=r" (rval) \
: "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL)); \
: "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL) : "cr0"); \
rval;})
#else
#define mftb() ({unsigned long rval; \
......
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