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From a095c6cde8a717325cc31bb393c547cad5e16e35 Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Wed, 27 Jul 2022 09:30:24 +0200
Subject: [PATCH 27/67] x86: deal with gcc12 release build issues
While a number of issues we previously had with pre-release gcc12 were
fixed in the final release, we continue to have one issue (with multiple
instances) when doing release builds (i.e. at higher optimization
levels): The compiler takes issue with subtracting (always 1 in our
case) from artifical labels (expressed as array) marking the end of
certain regions. This isn't an unreasonable position to take. Simply
hide the "array-ness" by casting to an integer type. To keep things
looking consistently, apply the same cast also on the respective
expressions dealing with the starting addresses. (Note how
efi_arch_memory_setup()'s l2_table_offset() invocations avoid a similar
issue by already having the necessary casts.) In is_xen_fixed_mfn()
further switch from __pa() to virt_to_maddr() to better match the left
sides of the <= operators.
Reported-by: Charles Arnold <carnold@suse.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 9723507daf2120131410c91980d4e4d9b0d0aa90
master date: 2022-07-19 08:37:29 +0200
---
xen/arch/x86/efi/efi-boot.h | 6 +++---
xen/include/asm-x86/mm.h | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index 2541ba1f320a..84fd77931456 100644
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -624,10 +624,10 @@ static void __init efi_arch_memory_setup(void)
* appropriate l2 slots to map.
*/
#define l2_4G_offset(a) \
- (((UINTN)(a) >> L2_PAGETABLE_SHIFT) & (4 * L2_PAGETABLE_ENTRIES - 1))
+ (((a) >> L2_PAGETABLE_SHIFT) & (4 * L2_PAGETABLE_ENTRIES - 1))
- for ( i = l2_4G_offset(_start);
- i <= l2_4G_offset(_end - 1); ++i )
+ for ( i = l2_4G_offset((UINTN)_start);
+ i <= l2_4G_offset((UINTN)_end - 1); ++i )
{
l2_pgentry_t pte = l2e_from_paddr(i << L2_PAGETABLE_SHIFT,
__PAGE_HYPERVISOR | _PAGE_PSE);
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 5c19b71eca70..71dd28f126c3 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -309,8 +309,8 @@ struct page_info
#define is_xen_heap_mfn(mfn) \
(mfn_valid(mfn) && is_xen_heap_page(mfn_to_page(mfn)))
#define is_xen_fixed_mfn(mfn) \
- (((mfn_to_maddr(mfn)) >= __pa(_stext)) && \
- ((mfn_to_maddr(mfn)) <= __pa(__2M_rwdata_end - 1)))
+ (((mfn_to_maddr(mfn)) >= virt_to_maddr((unsigned long)_stext)) && \
+ ((mfn_to_maddr(mfn)) <= virt_to_maddr((unsigned long)__2M_rwdata_end - 1)))
#define PRtype_info "016lx"/* should only be used for printk's */
--
2.37.3
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