Re: [PATCH v2 00/27 5.10.y] Backport minmax.h updates from v6.17-rc7

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Oct 17, 2025 at 05:09:24PM +0100, Nathan Chancellor wrote:
> On Fri, Oct 17, 2025 at 05:03:02PM +0200, Greg KH wrote:
> > On Fri, Oct 17, 2025 at 09:04:52AM +0000, Eliav Farber wrote:
> > > This series backports 27 patches to update minmax.h in the 5.10.y
> > > branch, aligning it with v6.17-rc7.
> > > 
> > > The ultimate goal is to synchronize all long-term branches so that they
> > > include the full set of minmax.h changes.
> > > 
> > > - 6.12.y has already been backported; the changes are included in
> > >   v6.12.49.
> > > - 6.6.y has already been backported; the changes are included in
> > >   v6.6.109.
> > > - 6.1.y has already been backported; the changes are currently in the
> > >   6.1-stable tree.
> > > - 5.15.y has already been backported; the changes are currently in the
> > >   5.15-stable tree.
> > 
> > With this series applied, on an arm64 server, building 'allmodconfig', I
> > get the following build error.
> > 
> > Oddly I don't see it on my x86 server, perhaps due to different compiler
> > versions?
> > 
> > Any ideas?
> > 
> > thanks,
> > 
> > greg k-h
> > 
> > ------------------------
> > 
> > In function ‘rt2800_txpower_to_dev’,
> >     inlined from ‘rt2800_config_channel’ at ../drivers/net/wireless/ralink/rt2x00/rt2800lib.c:4022:25:
> > ./../include/linux/compiler_types.h:309:45: error: call to ‘__compiletime_assert_1168’ declared with attribute error: clamp() low limit -7 greater than high limit 15
> >   309 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> >       |                                             ^
> > ./../include/linux/compiler_types.h:290:25: note: in definition of macro ‘__compiletime_assert’
> >   290 |                         prefix ## suffix();                             \
> >       |                         ^~~~~~
> > ./../include/linux/compiler_types.h:309:9: note: in expansion of macro ‘_compiletime_assert’
> >   309 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> >       |         ^~~~~~~~~~~~~~~~~~~
> > ../include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> >    39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> >       |                                     ^~~~~~~~~~~~~~~~~~
> > ../include/linux/minmax.h:188:9: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> >   188 |         BUILD_BUG_ON_MSG(statically_true(ulo > uhi),                            \
> >       |         ^~~~~~~~~~~~~~~~
> > ../include/linux/minmax.h:195:9: note: in expansion of macro ‘__clamp_once’
> >   195 |         __clamp_once(type, val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_), __UNIQUE_ID(h_))
> >       |         ^~~~~~~~~~~~
> > ../include/linux/minmax.h:218:36: note: in expansion of macro ‘__careful_clamp’
> >   218 | #define clamp_t(type, val, lo, hi) __careful_clamp(type, val, lo, hi)
> >       |                                    ^~~~~~~~~~~~~~~
> > ../drivers/net/wireless/ralink/rt2x00/rt2800lib.c:3980:24: note: in expansion of macro ‘clamp_t’
> >  3980 |                 return clamp_t(char, txpower, MIN_A_TXPOWER, MAX_A_TXPOWER);
> >       |                        ^~~~~~~
> 
> Missing commit 3bc753c06dd0 ("kbuild: treat char as always unsigned")?

That's going to be messy to backport, it's not even in 6.1.y, so let's
leave that alone if at all possible.

thanks,

greg k-h