diff options
| author |   Josh Poimboeuf <jpoimboe@redhat.com> | 2021-08-20 12:31:07 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-09-15 15:51:44 +0200 |
| commit | b7b205c3a0bc2b51f83cb793178ccbc12addf275 (patch) | |
| tree | 6cab1bfd99a35987d24f692ee218d91e2fae56bb /net/unix | |
| parent | x86/xen: Mark cpu_bringup_and_idle() as dead_end_function (diff) | |
| download | linux-dev-b7b205c3a0bc2b51f83cb793178ccbc12addf275.tar.xz linux-dev-b7b205c3a0bc2b51f83cb793178ccbc12addf275.zip | |
x86/xen: Move hypercall_page to top of the file
Because hypercall_page is page-aligned, the assembler inexplicably adds
an unreachable jump from after the end of the previous code to the
beginning of hypercall_page.
That confuses objtool, understandably. It also creates significant text
fragmentation. As a result, much of the object file is wasted text
(nops).
Move hypercall_page to the beginning of the file to both prevent the
text fragmentation and avoid the dead jump instruction.
$ size /tmp/head_64.before.o /tmp/head_64.after.o
text data bss dec hex filename
10924 307252 4096 322272 4eae0 /tmp/head_64.before.o
6823 307252 4096 318171 4dadb /tmp/head_64.after.o
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/20210820193107.omvshmsqbpxufzkc@treble
Diffstat (limited to 'net/unix')
0 files changed, 0 insertions, 0 deletions