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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-19 17:13:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-19 17:13:35 -0700
commit316e8d79a0959c302b0c462ab64b069599f10eef (patch)
treeefc46ca4f92669dc13bc79f86d8708c17e7c70d2 /Documentation
parent20621d2f27a0163b81dc2b74fd4c0b3e6aa5fa12 (diff)
pci_iounmap'2: Electric Boogaloo: try to make sense of it all
Nathan Chancellor reports that the recent change to pci_iounmap in commit 9caea0007601 ("parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled") causes build errors on arm64. It took me about two hours to convince myself that I think I know what the logic of that mess of #ifdef's in the <asm-generic/io.h> header file really aim to do, and rewrite it to be easier to follow. Famous last words. Anyway, the code has now been lifted from that grotty header file into lib/pci_iomap.c, and has fairly extensive comments about what the logic is. It also avoids indirecting through another confusing (and badly named) helper function that has other preprocessor config conditionals. Let's see what odd architecture did something else strange in this area to break things. But my arm64 cross build is clean. Fixes: 9caea0007601 ("parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled") Reported-by: Nathan Chancellor <nathan@kernel.org> Cc: Helge Deller <deller@gmx.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Ulrich Teichert <krypton@ulrich-teichert.org> Cc: James Bottomley <James.Bottomley@hansenpartnership.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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