[davidhildenbrand:folded_pgtable 22/32] arch/x86/mm/pat/set_memory.c:1678:18: warning: variable 'pud_pgprot' set but not used

[davidhildenbrand:folded_pgtable 22/32] arch/x86/mm/pat/set_memory.c:1678:18: warning: variable 'pud_pgprot' set but not used

[kernel test robot]

tree:   https://github.com/davidhildenbrand/linux folded_pgtable
head:   0551ca68b7552b7d71f1d2882635809a573d6c79
commit: 4592f8382e98e634f99ec4a27fa786304b128bb6 [22/32] x86: mm: skip pud setup when using folded pagetable
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20260709/202607091858.TwedThVk-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607091858.TwedThVk-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607091858.TwedThVk-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/mm/pat/set_memory.c: In function 'populate_pud':
>> arch/x86/mm/pat/set_memory.c:1678:18: warning: variable 'pud_pgprot' set but not used [-Wunused-but-set-variable]
    1678 |         pgprot_t pud_pgprot;
         |                  ^~~~~~~~~~


vim +/pud_pgprot +1678 arch/x86/mm/pat/set_memory.c

4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1671  
4547833602fdd3 arch/x86/mm/pageattr.c Kiryl Shutsemau 2017-03-17  1672  static int populate_pud(struct cpa_data *cpa, unsigned long start, p4d_t *p4d,
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1673  			pgprot_t pgprot)
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1674  {
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1675  	pud_t *pud;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1676  	unsigned long end;
e535ec0899d1fe arch/x86/mm/pageattr.c Matt Fleming    2016-09-20  1677  	long cur_pages = 0;
f5b2831d654167 arch/x86/mm/pageattr.c Juergen Gross   2014-11-03 @1678  	pgprot_t pud_pgprot;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1679  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1680  	end = start + (cpa->numpages << PAGE_SHIFT);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1681  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1682  	/*
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1683  	 * Not on a Gb page boundary? => map everything up to it with
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1684  	 * smaller pages.
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1685  	 */
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1686  	if (start & (PUD_SIZE - 1)) {
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1687  		unsigned long pre_end;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1688  		unsigned long next_page = (start + PUD_SIZE) & PUD_MASK;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1689  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1690  		pre_end   = min_t(unsigned long, end, next_page);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1691  		cur_pages = (pre_end - start) >> PAGE_SHIFT;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1692  		cur_pages = min_t(int, (int)cpa->numpages, cur_pages);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1693  
4547833602fdd3 arch/x86/mm/pageattr.c Kiryl Shutsemau 2017-03-17  1694  		pud = pud_offset(p4d, start);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1695  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1696  		/*
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1697  		 * Need a PMD page?
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1698  		 */
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1699  		if (pud_none(*pud))
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1700  			if (alloc_pmd_page(pud))
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1701  				return -1;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1702  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1703  		cur_pages = populate_pmd(cpa, start, pre_end, cur_pages,
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1704  					 pud, pgprot);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1705  		if (cur_pages < 0)
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1706  			return cur_pages;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1707  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1708  		start = pre_end;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1709  	}
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1710  
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1711  	/* We mapped them all? */
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1712  	if (cpa->numpages == cur_pages)
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1713  		return cur_pages;
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1714  
4547833602fdd3 arch/x86/mm/pageattr.c Kiryl Shutsemau 2017-03-17  1715  	pud = pud_offset(p4d, start);
f5b2831d654167 arch/x86/mm/pageattr.c Juergen Gross   2014-11-03  1716  	pud_pgprot = pgprot_4k_2_large(pgprot);
4b23538d88c87d arch/x86/mm/pageattr.c Borislav Petkov 2013-10-31  1717  

:::::: The code at line 1678 was first introduced by commit
:::::: f5b2831d654167d77da8afbef4d2584897b12d0c x86: Respect PAT bit when copying pte values between large and normal pages

:::::: TO: Juergen Gross <jgross@suse.com>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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