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Merge commit 2b0f5df7b4e0 from llvm-project (by Jessica Clarke):

Description

Merge commit 2b0f5df7b4e0 from llvm-project (by Jessica Clarke):

[builtins][Mips] Un-break FreeBSD build of __clear_cache

Commit 674a17e9bbe8 ("MIPS/compiler_rt: use synci to flush icache on
r6") completely removed the OS-specific guards under the guise of "For
pre-r6, we can use cacheflush libc function, which is same on Linux and
FreeBSD." However, the code in question had guards for Linux and
OpenBSD, not Linux and FreeBSD, and FreeBSD does not have a cacheflush
libc function as claimed, so this was neither the statement they
intended to make nor was it sufficient justification for making the code
completely unconditional. Whilst the upcoming FreeBSD 14 release has
dropped support for MIPS, FreeBSD 13 has support for it.

Fix this by only calling cacheflush on the OSes where it was previously
called, and not on other OSes where it either definitely isn't available
(FreeBSD) or is unknown (any other OS than the three mentioned in this
commit).

This is only needed for MFC'ing, as mips has been removed from
14-CURRENT.

PR: 271047
MFC after: immediately

Details

Provenance
dimAuthored on Jul 23 2023, 11:01 AM
Parents
rG83e67a9d14d9: xhci(4): Describe AMD 400 Series USB 3.1 controllers
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