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SubjectRe: [tip:x86:fpu 2/2] arch/x86/kernel/signal.c:626:4: error: implicit declaration of function '__setup_frame'
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Date
On Thu, 2012-07-26 at 07:27 +0800, Fengguang Wu wrote:
> Hi Suresh,
>
> Kernel build failed on
>
> tree: tip/x86/fpu x86/fpu
> head: 29221d4b89d4e50f05ade42ad3b22e92bb564ca4
> commit: 29221d4b89d4e50f05ade42ad3b22e92bb564ca4 [2/2] x86, fpu: Unify signal handling code paths for x86 and x86_64 kernels
> config: x86_64-randconfig-s003 (attached as .config)
>
> All related error/warning messages:
>
> arch/x86/kernel/signal.c: In function 'setup_rt_frame':
> arch/x86/kernel/signal.c:626:4: error: implicit declaration of function '__setup_frame' [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
> --
> arch/x86/kernel/xsave.c: In function 'save_fsave_header':
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: 'X86_FXSR_MAGIC' undeclared (first use in this function)
> arch/x86/kernel/xsave.c:145:7: note: each undeclared identifier is reported only once for each function it appears in
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c:145:7: error: dereferencing pointer to incomplete type
> arch/x86/kernel/xsave.c: In function 'save_user_xstate':
> arch/x86/kernel/xsave.c:209:15: warning: ignoring return value of '__clear_user', declared with attribute warn_unused_result [-Wunused-result]
>

Appended the patch for this. Thanks!
---
From: Suresh Siddha <suresh.b.siddha@intel.com>
Subject: x86, fpu: fix x86_64 build without CONFIG_IA32_EMULATION

Fengguang's automated build reported some compilation failures:
> arch/x86/kernel/signal.c: In function 'setup_rt_frame':
> arch/x86/kernel/signal.c:626:4: error: implicit declaration of function '__setup_frame'
> arch/x86/kernel/xsave.c: In function 'save_fsave_header':
> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
> ...

Fix x86_64 kernel build without CONFIG_IA32_EMULATION.

Code saving fsave prefix is applicable only for CONFIG_X86_32 or
CONFIG_IA32_EMULATION. Use config_enabled() checks to remove the unnecessary
code compile-time for x86_64 kernels build without CONFIG_IA32_EMULATION.

Also while we are at this, fix a spurious warning:
> arch/x86/kernel/xsave.c:209:15: warning: ignoring return value of ‘__clear_user’, declared with attribute warn_unused_result

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---
arch/x86/include/asm/fpu-internal.h | 2 +-
arch/x86/kernel/xsave.c | 10 ++++++++--
2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 35ad161..5779184 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -22,7 +22,7 @@
#include <asm/uaccess.h>
#include <asm/xsave.h>

-#ifdef CONFIG_IA32_EMULATION
+#ifdef CONFIG_X86_64
# include <asm/sigcontext32.h>
# include <asm/user32.h>
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 2917e34..a23d100 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -205,8 +205,8 @@ static inline int save_user_xstate(struct xsave_struct __user *buf)
else
err = fsave_user((struct i387_fsave_struct __user *) buf);

- if (unlikely(err))
- __clear_user(buf, xstate_size);
+ if (unlikely(err) && __clear_user(buf, xstate_size))
+ err = -EFAULT;
return err;
}

@@ -236,6 +236,9 @@ int save_xstate_sig(void __user *buf, void __user *buf_fx, int size)
struct task_struct *tsk = current;
int ia32_fxstate = (buf != buf_fx);

+ ia32_fxstate &= (config_enabled(CONFIG_X86_32) ||
+ config_enabled(CONFIG_IA32_EMULATION));
+
if (!access_ok(VERIFY_WRITE, buf, size))
return -EACCES;

@@ -333,6 +336,9 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
u64 xstate_bv = 0;
int fx_only = 0;

+ ia32_fxstate &= (config_enabled(CONFIG_X86_32) ||
+ config_enabled(CONFIG_IA32_EMULATION));
+
if (!buf) {
drop_fpu(tsk);
return 0;

--
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