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module/decompress: generate sysfs string at compile time

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compression_show() before (with noinline):
   0xffffffff810b5ff0 <+0>:     mov    %rdx,%rdi
   0xffffffff810b5ff3 <+3>:     mov    $0xffffffff81b55629,%rsi
   0xffffffff810b5ffa <+10>:    mov    $0xffffffff81b0cde2,%rdx
   0xffffffff810b6001 <+17>:    call   0xffffffff811b8fd0 <sysfs_emit>
   0xffffffff810b6006 <+22>:    cltq
   0xffffffff810b6008 <+24>:    ret

After:
   0xffffffff810b5ff0 <+0>:     mov    $0xffffffff81b0cde2,%rsi
   0xffffffff810b5ff7 <+7>:     mov    %rdx,%rdi
   0xffffffff810b5ffa <+10>:    call   0xffffffff811b8fd0 <sysfs_emit>
   0xffffffff810b5fff <+15>:    cltq
   0xffffffff810b6001 <+17>:    ret

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
David Disseldorp 2022-09-06 10:03:18 +02:00 • committed by Luis Chamberlain
parent beef988c20
commit 77d6354bd4
1 changed files with 1 additions and 1 deletions
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2
kernel/module/decompress.c
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@ -256,7 +256,7 @@ void module_decompress_cleanup(struct load_info *info)
static ssize_t compression_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%s\n", __stringify(MODULE_COMPRESSION));
return sysfs_emit(buf, __stringify(MODULE_COMPRESSION) "\n");
}
static struct kobj_attribute module_compression_attr = __ATTR_RO(compression);