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| author | Joakim Tjernlund <joakim.tjernlund@transmode.se> | 2010-01-08 09:46:26 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-01-15 05:26:16 +0300 |
| commit | 061ec9599f7ea515a3f08cd5cb74a03b2f9c56d2 (patch) | |
| tree | b078ad67594cc2794914e85e9fbbdb5642a0ff9d /arch/powerpc | |
| parent | 3e7b484354c8f60c12119c1c5174ef354696c30d (diff) | |
| download | linux-061ec9599f7ea515a3f08cd5cb74a03b2f9c56d2.tar.xz | |
powerpc/8xx: Fix user space TLB walk in dcbX fixup
The newly added fixup for buggy dcbX insn's has
a bug that always trigger a kernel TLB walk so a user space
dcbX insn will cause a Kernel Machine Check if it hits DTLB error.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index a2ed3422fa3d..3ef743fa5d7c 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -542,11 +542,11 @@ DARFixed:/* Return from dcbx instruction bug workaround, r10 holds value of DAR FixupDAR:/* Entry point for dcbx workaround. */ /* fetch instruction from memory. */ mfspr r10, SPRN_SRR0 + andis. r11, r10, 0x8000 /* Address >= 0x80000000 */ DO_8xx_CPU6(0x3780, r3) mtspr SPRN_MD_EPN, r10 mfspr r11, SPRN_M_TWB /* Get level 1 table entry address */ - cmplwi cr0, r11, 0x0800 - blt- 3f /* Branch if user space */ + beq- 3f /* Branch if user space */ lis r11, (swapper_pg_dir-PAGE_OFFSET)@h ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l rlwimi r11, r10, 32-20, 0xffc /* r11 = r11&~0xffc|(r10>>20)&0xffc */ |