Date: Fri, 10 Mar 2023 05:35:04 GMT From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: cc0fe048ec39 - main - kern: physmem: don't create a new exregion for different flags... Message-ID: <202303100535.32A5Z4xt015315@gitrepo.freebsd.org>
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The branch main has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=cc0fe048ec39636216ed59fa47eb311b2537cfc5 commit cc0fe048ec39636216ed59fa47eb311b2537cfc5 Author: Kyle Evans <kevans@FreeBSD.org> AuthorDate: 2023-03-10 05:27:39 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2023-03-10 05:27:39 +0000 kern: physmem: don't create a new exregion for different flags... ... if the region we're adding is an exact match to one that we already have. Simply extend the flags of the existing entry as needed so that we don't end up with duplicate regions. It could be that we got the exclusion through two different means, e.g., FDT memreserve and the EFI memory map, and we may derive different characteristics from each. Apply the most restrictive set to the region. Reported by: Mark Millard <marklmi yahoo com> Reviewed by: mhorne --- sys/kern/subr_physmem.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/sys/kern/subr_physmem.c b/sys/kern/subr_physmem.c index 1fb617078625..b76d25ed1ae2 100644 --- a/sys/kern/subr_physmem.c +++ b/sys/kern/subr_physmem.c @@ -376,8 +376,8 @@ insert_region(struct region *regions, size_t rcnt, vm_paddr_t addr, nend = addr + size; ep = regions + rcnt; for (i = 0, rp = regions; i < rcnt; ++i, ++rp) { + rend = rp->addr + rp->size; if (flags == rp->flags) { - rend = rp->addr + rp->size; if (addr <= rp->addr && nend >= rp->addr) { /* * New mapping overlaps at the beginning, shift @@ -404,7 +404,20 @@ insert_region(struct region *regions, size_t rcnt, vm_paddr_t addr, } return (rcnt); } + } else if ((flags != 0) && (rp->flags != 0)) { + /* + * If we're duplicating an entry that already exists + * exactly, just upgrade its flags as needed. We could + * do more if we find that we have differently specified + * flags clipping existing excluding regions, but that's + * probably rare. + */ + if (addr == rp->addr && nend == rend) { + rp->flags |= flags; + return (rcnt); + } } + if (addr < rp->addr) { bcopy(rp, rp + 1, (ep - rp) * sizeof(*rp)); break;
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