powerpc/powermac: Blacklist functions running with MMU disabled for kprobe

kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6316e8883753499073f47301857e4e88b73c3ddd.1585670437.git.christophe.leroy@c-s.fr

diff --git a/arch/powerpc/platforms/powermac/cache.S b/arch/powerpc/platforms/powermac/cache.S
index da69e0f..ced2254 100644 (file)
--- a/arch/powerpc/platforms/powermac/cache.S
+++ b/arch/powerpc/platforms/powermac/cache.S
@@ -184,6 +184,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
 
        mtlr    r10
        blr
+_ASM_NOKPROBE_SYMBOL(flush_disable_75x)
 
 /* This code is for 745x processors */
 flush_disable_745x:
@@ -351,4 +352,5 @@ END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
        mtmsr   r11             /* restore DR and EE */
        isync
        blr
+_ASM_NOKPROBE_SYMBOL(flush_disable_745x)
 #endif /* CONFIG_PPC_BOOK3S_32 */

diff --git a/arch/powerpc/platforms/powermac/sleep.S b/arch/powerpc/platforms/powermac/sleep.S
index bd6085b..f9a680f 100644 (file)
--- a/arch/powerpc/platforms/powermac/sleep.S
+++ b/arch/powerpc/platforms/powermac/sleep.S
@@ -244,7 +244,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
        mtmsr   r2
        isync
        b       1b
-
+_ASM_NOKPROBE_SYMBOL(low_cpu_die)
 /*
  * Here is the resume code.
  */
@@ -282,6 +282,7 @@ _GLOBAL(core99_wake_up)
        lwz     r1,0(r3)
 
        /* Pass thru to older resume code ... */
+_ASM_NOKPROBE_SYMBOL(core99_wake_up)
 /*
  * Here is the resume code for older machines.
  * r1 has the physical address of SL_PC(sp).
@@ -429,6 +430,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
        lwz     r0,4(r1)
        mtlr    r0
        blr
+_ASM_NOKPROBE_SYMBOL(grackle_wake_up)
 
 turn_on_mmu:
        mflr    r4
@@ -438,6 +440,7 @@ turn_on_mmu:
        sync
        isync
        rfi
+_ASM_NOKPROBE_SYMBOL(turn_on_mmu)
 
 #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */