* [PATCH fixes] powerpc/40x: Make more space for system call exception
@ 2020-05-09 17:05 ` Christophe Leroy
0 siblings, 0 replies; 3+ messages in thread
From: Christophe Leroy @ 2020-05-09 17:05 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
Cc: linux-kernel, linuxppc-dev
When CONFIG_VIRT_CPU_ACCOUNTING is selected, system call exception
handler doesn't fit below 0xd00 and build fails.
As exception 0xd00 doesn't exist and is never generated by 40x,
comment it out in order to get more space for system call exception.
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 9e27086292aa ("powerpc/32: Warn and return ENOSYS on syscalls from kernel")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_40x.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 9bb663977e84..2cec543c38f0 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -344,8 +344,9 @@ _ENTRY(saved_ksp_limit)
/* 0x0C00 - System Call Exception */
START_EXCEPTION(0x0C00, SystemCall)
SYSCALL_ENTRY 0xc00
+/* Trap_0D is commented out to get more space for system call exception */
- EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD)
+/* EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD) */
EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_STD)
--
2.25.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH fixes] powerpc/40x: Make more space for system call exception
@ 2020-05-09 17:05 ` Christophe Leroy
0 siblings, 0 replies; 3+ messages in thread
From: Christophe Leroy @ 2020-05-09 17:05 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
Cc: linuxppc-dev, linux-kernel
When CONFIG_VIRT_CPU_ACCOUNTING is selected, system call exception
handler doesn't fit below 0xd00 and build fails.
As exception 0xd00 doesn't exist and is never generated by 40x,
comment it out in order to get more space for system call exception.
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 9e27086292aa ("powerpc/32: Warn and return ENOSYS on syscalls from kernel")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_40x.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 9bb663977e84..2cec543c38f0 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -344,8 +344,9 @@ _ENTRY(saved_ksp_limit)
/* 0x0C00 - System Call Exception */
START_EXCEPTION(0x0C00, SystemCall)
SYSCALL_ENTRY 0xc00
+/* Trap_0D is commented out to get more space for system call exception */
- EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD)
+/* EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD) */
EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_STD)
--
2.25.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH fixes] powerpc/40x: Make more space for system call exception
2020-05-09 17:05 ` Christophe Leroy
(?)
@ 2020-05-13 12:43 ` Michael Ellerman
-1 siblings, 0 replies; 3+ messages in thread
From: Michael Ellerman @ 2020-05-13 12:43 UTC (permalink / raw)
To: Michael Ellerman, Christophe Leroy, Paul Mackerras,
Benjamin Herrenschmidt
Cc: linuxppc-dev, linux-kernel
On Sat, 9 May 2020 17:05:11 +0000 (UTC), Christophe Leroy wrote:
> When CONFIG_VIRT_CPU_ACCOUNTING is selected, system call exception
> handler doesn't fit below 0xd00 and build fails.
>
> As exception 0xd00 doesn't exist and is never generated by 40x,
> comment it out in order to get more space for system call exception.
Applied to powerpc/fixes.
[1/1] powerpc/40x: Make more space for system call exception
https://git.kernel.org/powerpc/c/249c9b0cd193d983c3a0b00f3fd3b92333bfeebe
cheers
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-05-09 17:05 ` Christophe Leroy
2020-05-13 12:43 ` Michael Ellerman
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