Commit 32a82067 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

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: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Acked-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6316e8883753499073f47301857e4e88b73c3ddd.1585670437.git.christophe.leroy@c-s.fr
parent 7aa85127

arch/powerpc/platforms/powermac/cache.S

+2 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/platforms/powermac/sleep.S

+4 −1
Original line number Diff line number Diff line
@@ -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) */