tree 6da95f8bac1469c60178636ddc3991a14a958861
parent 8f5ae30d69d7543eee0d70083daf4de8fe15d585
author Varad Gautam <varadgautam@google.com> 1743352949 +0000
committer Arnd Bergmann <arnd@arndb.de> 1758723673 +0200

asm-generic/io.h: Skip trace helpers if rwmmio events are disabled

With `CONFIG_TRACE_MMIO_ACCESS=y`, the `{read,write}{b,w,l,q}{_relaxed}()`
mmio accessors unconditionally call `log_{post_}{read,write}_mmio()`
helpers, which in turn call the ftrace ops for `rwmmio` trace events

This adds a performance penalty per mmio accessor call, even when
`rwmmio` events are disabled at runtime (~80% overhead on local
measurement).

Guard these with `tracepoint_enabled()`.

Signed-off-by: Varad Gautam <varadgautam@google.com>
Fixes: 210031971cdd ("asm-generic/io: Add logging support for MMIO accessors")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>