[PATCH] Loongarch: adapt for the re-introduction of fstat and newfstatat in 6.11

[Xi Ruoyao]

The email address of Joseph was outdated.  I got a bounce from
mentor.com.

On Tue, 2024-08-20 at 20:44 +0800, Xi Ruoyao wrote:
> On Tue, 2024-08-20 at 20:27 +0800, Miao Wang via B4 Relay wrote:
> 
> > Kernel 6.11 adds back fstat and newfstatat in commit 7697a0fe0154
> > ("LoongArch: Define __ARCH_WANT_NEW_STAT in unistd.h"). With kernel
> > headers from 6.11, make update-syscall-lists will generate the
> > following
> > diffs:
> > 
> > diff --git a/sysdeps/unix/sysv/linux/loongarch/arch-syscall.h
> > b/sysdeps/unix/sysv/linux/loongarch/arch-syscall.h
> 
> Don't directly embed a diff here (w/o some mangling).  Doing so will
> puzzle patchwork, git am, etc to consider it a part of the patch. 
> Look
> at the unwanted effect at
> https://patchwork.sourceware.org/project/glibc/patch/20240820-loong-fstat-v1-1-799b6627bb2f@gmail.com/
> .
> 
> > +#include_next <kernel-features.h>
> > +
> > +#define __ASSUME_LOONGARCH_NEWSTAT 1
> > +
> > +/* No support for fstat or newfstatat before 6.11.  */
> 
> 6.10.6, the change is backported so we can assume anything >= 6.10.6
> have these syscalls.  But we cannot make a reasonable assumption with
> other backports like 6.6.47.
> 
> > +#if __LINUX_KERNEL_VERSION < 0x060b00
> 
> 0x060a06.
> 
> > +# undef __ASSUME_LOONGARCH_NEWSTAT
> 
> Can we just #undef __NR_fstat and #undef __NR_newfstatat here?  Sparc
> is
> undefining __NR_pause in their kernel-features.h.
> 
> > +#endif
> 

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University