powerpc/mm: Update the memory limit based on direct mapping restrictions

memory limit value specified by the user are further updated such that
the value is 16MB aligned. This is because hash translation mode use
16MB as direct mapping page size. Make sure we update the global
variable 'memory_limit' with the 16MB aligned value such that all kernel
components will see the new aligned value of the memory limit.

Signed-off-by: Aneesh Kumar K.V (IBM) <aneesh.kumar@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240403083611.172833-3-aneesh.kumar@kernel.org

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 7451bedad1f43ea7c4cb57907f7479ae31a8551b..b8f764453eaa0cfa85074aef6a28f3ccf56affbb 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -779,7 +779,6 @@ static inline void save_fscr_to_task(void) {}
 
 void __init early_init_devtree(void *params)
 {
-       phys_addr_t limit;
 
        DBG(" -> early_init_devtree(%px)\n", params);
 
@@ -850,8 +849,8 @@ void __init early_init_devtree(void *params)
                memory_limit = 0;
 
        /* Align down to 16 MB which is large page size with hash page translation */
-       limit = ALIGN_DOWN(memory_limit ?: memblock_phys_mem_size(), SZ_16M);
-       memblock_enforce_memory_limit(limit);
+       memory_limit = ALIGN_DOWN(memory_limit ?: memblock_phys_mem_size(), SZ_16M);
+       memblock_enforce_memory_limit(memory_limit);
 
 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES)
        if (!early_radix_enabled())