Linux-stable-mirror May 2025

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1253 discussions

Older kernels like 6.6 and lower may not compile with GCC15 due to -std=gnu23

by Philip Müller

Hi all, GCC 15 changed the default C standard dialect from gnu17 to gnu23, which should not have impacted the kernel because it explicitly requests the gnu11 standard in the main Makefile. However I see these errors in older kernels series and some realtime kernels: 5.4, 5.10, 5.15, 6.1, 6.1-rt, 6.6, 6.13-rt 2025-04-30T19:26:10.5226566Z from arch/x86/realmode/rm/wakemain.c:2: 2025-04-30T19:26:10.5228293Z ./include/linux/stddef.h:11:9: error: cannot use keyword ‘false’ as enumeration constant 2025-04-30T19:26:10.5229525Z 11 | false = 0, 2025-04-30T19:26:10.5230691Z | ^~~~~ 2025-04-30T19:26:10.5232337Z ./include/linux/stddef.h:11:9: note: ‘false’ is a keyword with ‘-std=c23’ onwards 2025-04-30T19:26:10.5234141Z ./include/linux/types.h:30:33: error: ‘bool’ cannot be defined via ‘typedef’ 2025-04-30T19:26:10.5235478Z 30 | typedef _Bool bool; 2025-04-30T19:26:10.5236557Z | ^~~~ 2025-04-30T19:26:10.5238016Z ./include/linux/types.h:30:33: note: ‘bool’ is a keyword with ‘-std=c23’ onwards 2025-04-30T19:26:10.5239544Z ./include/linux/types.h:30:1: warning: useless type name in empty declaration 2025-04-30T19:26:10.5241119Z 30 | typedef _Bool bool; 2025-04-30T19:26:10.5242189Z | ^~~~~~~ 2025-04-30T19:26:10.5351835Z make[4]: *** [scripts/Makefile.build:250: arch/x86/realmode/rm/wakemain.o] Error 1 2025-04-30T19:26:10.5362380Z make[3]: *** [arch/x86/realmode/Makefile:22: arch/x86/realmode/rm/realmode.bin] Error 2 I found this with mips: https://lkml.iu.edu/hypermail/linux/kernel/2503.2/09285.html Do we miss some patch not backported? -- Best, Philip

1 month

[Patch v2 3/4] uio_hv_generic: Adjust ring size according to system page alignment

by longli＠linuxonhyperv.com

From: Long Li <longli(a)microsoft.com> Following the ring header, the ring data should align to system page boundary. Adjust the size if necessary. Cc: stable(a)vger.kernel.org Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus") Signed-off-by: Long Li <longli(a)microsoft.com> --- drivers/uio/uio_hv_generic.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 08385b04c4ab..dfc5f0e1a254 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -256,6 +256,12 @@ hv_uio_probe(struct hv_device *dev, if (!ring_size) ring_size = SZ_2M; + /* + * Adjust ring size if necessary to have the ring data region page + * aligned + */ + ring_size = VMBUS_RING_SIZE(ring_size); + pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; -- 2.34.1

1 month

[Patch v2 2/4] uio_hv_generic: Use correct size for interrupt and monitor pages

by longli＠linuxonhyperv.com

From: Long Li <longli(a)microsoft.com> Interrupt and monitor pages should be in Hyper-V page size (4k bytes). This can be different to the system page size. This size is read and used by the user-mode program to determine the mapped data region. An example of such user-mode program is the VMBUS driver in DPDK. Cc: stable(a)vger.kernel.org Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus") Signed-off-by: Long Li <longli(a)microsoft.com> --- drivers/uio/uio_hv_generic.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 1b19b5647495..08385b04c4ab 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -287,13 +287,13 @@ hv_uio_probe(struct hv_device *dev, pdata->info.mem[INT_PAGE_MAP].name = "int_page"; pdata->info.mem[INT_PAGE_MAP].addr = (uintptr_t)vmbus_connection.int_page; - pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE; + pdata->info.mem[INT_PAGE_MAP].size = HV_HYP_PAGE_SIZE; pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL; pdata->info.mem[MON_PAGE_MAP].name = "monitor_page"; pdata->info.mem[MON_PAGE_MAP].addr = (uintptr_t)vmbus_connection.monitor_pages[1]; - pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE; + pdata->info.mem[MON_PAGE_MAP].size = HV_HYP_PAGE_SIZE; pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL; if (channel->device_id == HV_NIC) { -- 2.34.1

1 month

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Linux-stable-mirror May 2025