Files
android_kernel_xiaomi_sm8450/include/net
Denys Vlasenko f9a7cbbf18 net: force inlining of netif_tx_start/stop_queue, sock_hold, __sock_put
Sometimes gcc mysteriously doesn't inline
very small functions we expect to be inlined. See
    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66122
Arguably, gcc should do better, but gcc people aren't willing
to invest time into it, asking to use __always_inline instead.

With this .config:
http://busybox.net/~vda/kernel_config_OPTIMIZE_INLINING_and_Os,
the following functions get deinlined many times.

netif_tx_stop_queue: 207 copies, 590 calls:
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 80 8f e0 01 00 00 01 lock orb $0x1,0x1e0(%rdi)
	5d                      pop    %rbp
	c3                      retq

netif_tx_start_queue: 47 copies, 111 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 80 a7 e0 01 00 00 fe lock andb $0xfe,0x1e0(%rdi)
	5d                      pop    %rbp
	c3                      retq

sock_hold: 39 copies, 124 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 ff 87 80 00 00 00    lock incl 0x80(%rdi)
	5d                      pop    %rbp
	c3                      retq

__sock_put: 6 copies, 13 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 ff 8f 80 00 00 00    lock decl 0x80(%rdi)
	5d                      pop    %rbp
	c3                      retq

This patch fixes this via s/inline/__always_inline/.

Code size decrease after the patch is ~2.5k:

    text      data      bss       dec     hex filename
56719876  56364551 36196352 149280779 8e5d80b vmlinux_before
56717440  56364551 36196352 149278343 8e5ce87 vmlinux

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: David S. Miller <davem@davemloft.net>
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
CC: netfilter-devel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-13 22:40:54 -04:00
..
2014-09-18 10:54:36 +02:00
2015-03-04 00:23:23 -05:00
2015-06-28 16:55:44 -07:00
2016-03-18 23:14:15 -04:00
2015-11-18 16:17:38 -05:00
2015-03-06 21:50:02 -05:00
2016-03-01 16:07:29 -05:00
2015-09-17 17:18:37 -07:00
2016-02-16 20:21:48 -05:00
2014-09-30 01:02:26 -04:00
2016-03-10 14:42:03 -05:00
2016-02-21 22:00:28 -05:00
2015-10-23 06:26:42 -07:00
2016-03-23 22:09:58 -04:00
2016-03-11 12:04:37 -05:00
2016-04-07 16:53:30 -04:00
2014-06-02 11:00:41 -07:00
2015-03-12 22:58:12 -04:00
2016-04-04 22:11:20 -04:00
2015-10-26 22:24:22 -07:00
2016-04-07 16:53:29 -04:00