5be413a6e2
- Add various missing READ_ONCE() to cmpxchg() loops prevent the compiler from potentially generating incorrect code. This includes a rather large change to the s390 specific hardware sampling code and its current use of cmpxchg_double(). Do the fix now to get it out of the way of Peter Zijlstra's cmpxchg128() work, and have something that can be backported. The added new code includes a private 128 bit cmpxchg variant which will be removed again after Peter's rework is available. Also note that this 128 bit cmpxchg variant is used to implement 128 bit READ_ONCE(), while strictly speaking it wouldn't be necessary, and _READ_ONCE() should also be sufficient; even though it isn't obvious for all converted locations that this is the case. Therefore use this implementation for for the sake of clarity and consistency for now. - Fix ipl report address handling to avoid kdump failures/hangs. - Fix misuse of #(el)if in kernel decompressor. - Define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36, caused by the recently changed discard behaviour. - Make sure _edata and _end symbols are always page aligned. - The current header guard DEBUG_H in one of the s390 specific header files is too generic and conflicts with the ath9k wireless driver. Add an _ASM_S390_ prefix to the guard to make it unique. - Update defconfigs. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEECMNfWEw3SLnmiLkZIg7DeRspbsIFAmPAQ6UACgkQIg7DeRsp bsLE5A//cAmO6yS21zVA9aPypX2ZzCkhYH7hNr/8DQBQsDS5+VvgBFOIrQ7v2I+Q nBpdjUKMe+E8knAHX56cAXpOttdQmhxq4TURMNBX7LnXOcKmwAmAh9kQ4i+Og0yn 0SLiiGlVdKT5UlLd6LyRpPjnovNNW9x4UYiPY7D2Vr2T1r6/6HGH3xT2+E7fsVU9 ydkGBJ39oyZkO6WSk7TzvjLDI/fUroQYmFYHq8KWo5mrC/WxAo037nvA8Kn5TFdr g3xXdblqEC5m80U7Xx614cXD8leNA1x9gjsQKE2Nwedq1yed3o7NO0YF8va2NZot 18YpvNOLaaOeWwIvISJG5if1/h8UASx3hvzlZk98koKteoR09WnKadcHmM43HI++ eb6DuxTePZaX352EghDWyo3A9ELR9FmfQ0/Eu5RQ2XtSi3dChKEPztKABk9V0J1x itnVM1kGQdXxNL34qe9h8EzaqTbrQmec7ItMoM8uAs6q4RJ68Hx9hUynbq0qLAbd JyOoxMOkC+rqkGGAECtxegQAavr929F+OgP2C4P8mJDggoFi/czxK/sS+m1KbvW2 AtrHgqCg4PNv9IB8iwd7bGpFvfPcPgkWWp7omeZw9MVKDhwXaxjfbmtb3kyFDNzP 7fXKR1YlIPLbHX4q0hJSsT4Cfb2iA3Z6yVH+aZreV5n1jogmsoU= =IJd/ -----END PGP SIGNATURE----- Merge tag 's390-6.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 fixes from Heiko Carstens: - Add various missing READ_ONCE() to cmpxchg() loops prevent the compiler from potentially generating incorrect code. This includes a rather large change to the s390 specific hardware sampling code and its current use of cmpxchg_double(). Do the fix now to get it out of the way of Peter Zijlstra's cmpxchg128() work, and have something that can be backported. The added new code includes a private 128 bit cmpxchg variant which will be removed again after Peter's rework is available. Also note that this 128 bit cmpxchg variant is used to implement 128 bit READ_ONCE(), while strictly speaking it wouldn't be necessary, and _READ_ONCE() should also be sufficient; even though it isn't obvious for all converted locations that this is the case. Therefore use this implementation for for the sake of clarity and consistency for now. - Fix ipl report address handling to avoid kdump failures/hangs. - Fix misuse of #(el)if in kernel decompressor. - Define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36, caused by the recently changed discard behaviour. - Make sure _edata and _end symbols are always page aligned. - The current header guard DEBUG_H in one of the s390 specific header files is too generic and conflicts with the ath9k wireless driver. Add an _ASM_S390_ prefix to the guard to make it unique. - Update defconfigs. * tag 's390-6.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390: update defconfigs KVM: s390: interrupt: use READ_ONCE() before cmpxchg() s390/percpu: add READ_ONCE() to arch_this_cpu_to_op_simple() s390/cpum_sf: add READ_ONCE() semantics to compare and swap loops s390/kexec: fix ipl report address for kdump s390: fix -Wundef warning for CONFIG_KERNEL_ZSTD s390: define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36 s390: expicitly align _edata and _end symbols on page boundary s390/debug: add _ASM_S390_ prefix to header guard |
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