[v4][PATCH 8/8] book3e/kexec/kdump: recover "r4 = 0" to create the initial TLB
In commit 96f013f, "powerpc/kexec: Add kexec "hold" support for Book3e processors", requires that GPR4 survive the "hold" process, for IBM Blue Gene/Q with with some very strange firmware. But for FSL Book3E, r4 = 1 to indicate that the initial TLB entry for this core already exists so we still should set r4 with 0 to create that initial TLB. Signed-off-by: Tiejun Chen --- arch/powerpc/kernel/head_64.S |4 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index fa74d20..001b112 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -127,6 +127,10 @@ __secondary_hold: /* Grab our physical cpu number */ mr r24,r3 /* stash r4 for book3e */ +#ifdef CONFIG_PPC_FSL_BOOK3E + /* we need to setup initial TLB entry. */ + li r4,0 +#endif mr r25,r4 /* Tell the master cpu we're here */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[v4][PATCH 8/8] book3e/kexec/kdump: recover r4 = 0 to create the initial TLB
In commit 96f013f, powerpc/kexec: Add kexec hold support for Book3e processors, requires that GPR4 survive the hold process, for IBM Blue Gene/Q with with some very strange firmware. But for FSL Book3E, r4 = 1 to indicate that the initial TLB entry for this core already exists so we still should set r4 with 0 to create that initial TLB. Signed-off-by: Tiejun Chen tiejun.c...@windriver.com --- arch/powerpc/kernel/head_64.S |4 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index fa74d20..001b112 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -127,6 +127,10 @@ __secondary_hold: /* Grab our physical cpu number */ mr r24,r3 /* stash r4 for book3e */ +#ifdef CONFIG_PPC_FSL_BOOK3E + /* we need to setup initial TLB entry. */ + li r4,0 +#endif mr r25,r4 /* Tell the master cpu we're here */ -- 1.7.9.5 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
