[POWERPC] spufs: Cleanup ELF coredump extra notes logic

To start with, arch_notes_size() etc. is a little too ambiguous a name for
my liking, so change the function names to be more explicit.

Calling through macros is ugly, especially with hidden parameters, so don't
do that, call the routines directly.

Use ARCH_HAVE_EXTRA_ELF_NOTES as the only flag, and based on it decide
whether we want the extern declarations or the empty versions.

Since we have empty routines, actually use them in the coredump code to
save a few #ifdefs.

We want to change the handling of foffset so that the write routine updates
foffset as it goes, instead of using file->f_pos (so that writing to a pipe
works).  So pass foffset to the write routine, and for now just set it to
file->f_pos at the end of writing.

It should also be possible for the write routine to fail, so change it to
return int and treat a non-zero return as failure.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/platforms/cell/spu_syscalls.c b/arch/powerpc/platforms/cell/spu_syscalls.c
index 05841cdef4e1b71d47882e7fe70c4e68ea14ebcf..b0117a7c6100f7ebc86cbc97181bb0c3a755db2b 100644 (file)
--- a/arch/powerpc/platforms/cell/spu_syscalls.c
+++ b/arch/powerpc/platforms/cell/spu_syscalls.c
@@ -21,6 +21,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 #include <linux/file.h>
+#include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/syscalls.h>
 #include <linux/rcupdate.h>
@@ -112,7 +113,7 @@ asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
        return ret;
 }
 
-int arch_notes_size(void)
+int elf_coredump_extra_notes_size(void)
 {
        struct spufs_calls *calls;
        int ret;
@@ -128,17 +129,22 @@ int arch_notes_size(void)
        return ret;
 }
 
-void arch_write_notes(struct file *file)
+int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset)
 {
        struct spufs_calls *calls;
 
        calls = spufs_calls_get();
        if (!calls)
-               return;
+               return 0;
 
        calls->coredump_extra_notes_write(file);
 
        spufs_calls_put(calls);
+
+       /* Fudge foffset for now */
+       *foffset = file->f_pos;
+
+       return 0;
 }
 
 int register_spu_syscalls(struct spufs_calls *calls)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 4482a0673b1591869c63358a1db6a21582848252..b1013f34085d00ac4b966e895ac58419f4ae3269 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1514,9 +1514,6 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
        int thread_status_size = 0;
        elf_addr_t *auxv;
        unsigned long mm_flags;
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
-       int extra_notes_size;
-#endif
 
        /*
         * We no longer stop all VM operations.
@@ -1645,10 +1642,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
                
                sz += thread_status_size;
 
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
-               extra_notes_size = ELF_CORE_EXTRA_NOTES_SIZE;
-               sz += extra_notes_size;
-#endif
+               sz += elf_coredump_extra_notes_size();
 
                fill_elf_note_phdr(&phdr, sz, offset);
                offset += sz;
@@ -1698,10 +1692,8 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
                if (!writenote(notes + i, file, &foffset))
                        goto end_coredump;
 
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
-       ELF_CORE_WRITE_EXTRA_NOTES;
-       foffset += extra_notes_size;
-#endif
+       if (elf_coredump_extra_notes_write(file, &foffset))
+               goto end_coredump;
 
        /* write out the thread status notes section */
        list_for_each(t, &thread_list) {

diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h
index de507995c7b1e0504c6831e84abb50c8eb2cfea3..e42820d6d25bcf0a218948d58a26fc7f149566fd 100644 (file)
--- a/include/asm-powerpc/elf.h
+++ b/include/asm-powerpc/elf.h
@@ -413,13 +413,8 @@ do {                                                                       \
 /* Notes used in ET_CORE. Note name is "SPU/<fd>/<filename>". */
 #define NT_SPU         1
 
-extern int arch_notes_size(void);
-extern void arch_write_notes(struct file *file);
-
-#define ELF_CORE_EXTRA_NOTES_SIZE arch_notes_size()
-#define ELF_CORE_WRITE_EXTRA_NOTES arch_write_notes(file)
-
 #define ARCH_HAVE_EXTRA_ELF_NOTES
-#endif /* CONFIG_PPC_CELL */
+
+#endif /* CONFIG_SPU_BASE */
 
 #endif /* _ASM_POWERPC_ELF_H */

diff --git a/include/linux/elf.h b/include/linux/elf.h
index 8b17ffe222c462c8133cb507e3e90767f53b80ab..d2da84acf45d8266bc4fd1b7cea428b1c7296a73 100644 (file)
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -389,12 +389,14 @@ extern Elf64_Dyn _DYNAMIC [];
 
 #endif
 
+/* Optional callbacks to write extra ELF notes. */
 #ifndef ARCH_HAVE_EXTRA_ELF_NOTES
-static inline int arch_notes_size(void) { return 0; }
-static inline void arch_write_notes(struct file *file) { }
-
-#define ELF_CORE_EXTRA_NOTES_SIZE arch_notes_size()
-#define ELF_CORE_WRITE_EXTRA_NOTES arch_write_notes(file)
-#endif /* ARCH_HAVE_EXTRA_ELF_NOTES */
+static inline int elf_coredump_extra_notes_size(void) { return 0; }
+static inline int elf_coredump_extra_notes_write(struct file *file,
+                       loff_t *foffset) { return 0; }
+#else
+extern int elf_coredump_extra_notes_size(void);
+extern int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset);
+#endif
 
 #endif /* _LINUX_ELF_H */